<p>This seems to be explained in <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="254644881" data-permission-text="Issue title is private" data-url="https://github.com/mapnik/mapnik/issues/3749" href="https://github.com/mapnik/mapnik/issues/3749">mapnik/mapnik#3749</a> and is apparently a result of some of the operations used in the style sheet :-(</p>
<p>Not sure there's much we can do, and it's not technically an issue with the web site but rather with the style sheet and/or the export script on the render servers.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/openstreetmap/openstreetmap-website/issues/1998#issuecomment-422504537">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/ABWnLaVT6DBdFtwfycP0hm-LS1JjnRvfks5ucT9QgaJpZM4Wueb-">mute the thread</a>.<img src="https://github.com/notifications/beacon/ABWnLfHx3M6JNbc3oQuCEz1DfKOW5cxfks5ucT9QgaJpZM4Wueb-.gif" height="1" width="1" alt="" /></p>
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